Dry and wet deposition of nitrogen in the upstream basin of Gangnan Reservoir

In this study , w e chose fiv e sam pling points in Gangnan reserv oir basin to m onitor nitro gen depo sitions. We analyzed the spatial and t em po ral distributio n characteristics o f dr y and w et depo sition fluxes o f atm ospheric nit rog en fr om July 2015 to June 2016. T he r esults show ed that dry and w et depositio n flux es of to tal nitr og en wer e 171 721341 7 kg/ ( km 2 # month) and 91 923861 8 kg/ ( km2 # m onth) r espectively. The nitr ate and or ganic nit rog en w ere the dominant contributors to atmo spheric dr y depositio n flux . Their amount w as hig her in spring and summer. The nitr og en form s in w et depositio n w ere m ainly amm onia nitro g en and nitr ate nitro g en, the am ount of w hich w as hig her in sum mer and spring and low er in fall and w inter. In t erms of spat ial dist ribution, ther e w as an increasing tr end f rom the northw est to the so utheast. Based o n the t otal amo unt o f atm os2 pheric nitro g en deposit ion, w at ershed ar ea, and r eserv oir surface area, w e calculated the tota l atmo spheric nitr og en depositio n into riv er fo r the w hole ba sin, w hich w as 3 674 t/ a. The dir ect nitr og en depo sition into the Gang nan reser vo ir w as 1 051 16 t/ a

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